Scale



y I1626 82s May 3 1927' J. HoPKlNsoN SCALE Filed sept. 4. 1924 l5 `a@ fi 2l QL! //o v f6 l v 9 A o rui-1 4 l o r I/0 mle I 'Z4' r J5 l/ /LV ,1L j

wue/nto Patented May 3, 1927.

UNITED STATES PATENT OFFICE.

JOSEPH HOPKINSON, OF DAYTON, OHIO, ASSIGNOR TO DAYTON SCALE COMPANY, OF DAYTON, OHIO, A CORPORATION OF NEW JERSEY.

SCALE.

Application filed September 4, 1924.

This invention relates to certain new and useful improvements in the scale shown Iand described in my Patent No. 817,777 and in my copending application, Serial No. 73,378, tiled August 27, 1924;.

The objects of the present invention reside in the provision of a novel form ot indicater drive device adapted tor cooperation with an even balance scale having a suitable base lever system such as that shown in my Patent No. 817,777. v

The objects of the present invention reside in the provision of a novel form ot indicator drive which is adapted to give an f increased range of indicator movement whereby it is possible to utilize charts having graduations spaced further apart.'

The present invention contemplates the provision ot a sector shaped rack tor driving a pivotal indicator, this sector shaped rack being directly secured to the pendulum counterbalancing system. Also cooperating with the pivotal indicator is a supplementary sector which is adapted to constantly keep the pinion on the pivotal indicator shaft in enmeshment with the driving rack upon one side of the teeth thereof thereby obtaining greater accuracy ot operation of the indicator.

In the drawings,

Fig. l is a front vievi7 of one embodiment of my invention. v

Fig. 2 is a detail view of a modification.

In more detail, l0 is the base of the scale having a central bearing 11 adapted to support knife edges I2 carried by the equal arm lever 13. The equal arm lever 13 has adjacent its ends the usual knife edge pivots 'l/lf which support the goods receiver l5 and weight receivel.' IG. These rmfoivors are rcspeotively supliortod upon the base leve-r through intermediate check members 17 and I7". These check members extend up'ivarfb ly in the housing and at their upper ends connect to the check links 1S and 18a respectively.

In place of using the base lever system herein illustrated I also contemplate the use ot any ot the other Well known terms ot even balance base lever systems. For example, I may provide the Beranger balance type of base lever system or, if desired, the lever system maybe that employed in the Roverval balance. As an Serial No. 735,732.

illustration oi the Berangcr type ol'i lever f system reference may be made to my former latent No. IJSLS, dated August fil, 1915.

The scale is preferably provided With a suitable pedestal or column i9 which is suitably sul'iportod on the base and at its upper end has secured to it a chart housing 20. lllitliiirthe chart housing are suitable charts, one olf Which is shown at 2l. It will be understood that the usual back chart may also be employed if desired.

For automatically eounterbalancing the applied load a pendulum counterbalance 26 is provided. This counterbalance is suitably mounted upon llznife edges 24: and is provided with the usual cam 23 preferably adjustably secured to the pendulum 26. The pendulum load counterbalancing system is connected to the check member 17 through a tape 27. It will be understood that with other forms ot base lever systems the tape 27 Would connect to any suitable point on the lever system Which moves substantially vertical during the loading of the scale.

Indicator dri/ving' ale/vices.

For indicating the applied load I provide a pivotal indicator 30. This pivotal indicator is properly balanced and carried on an arbor 3l Which in turn is suitably mounted in ball bearings carried on a fixed part of the casing. Fast upon the arbor 31 is a pinion 32. For effecting rotation of the pinion 32 a sector shaped rack 33 is provided which is mounted upon the pendulum counterbalancing system so as to rock in unison therewith.

Inasmuch as Vfriction between the pinion 32 and the sector rack 32% must be avoided it is desirable that the rack teeth and pinion tooth loosely mesh. With such loose enmeshment there is a slight amount of play between the cooperating teeth. This play is suliicient to cause a slight amount of error in the indicatingr position ot the pointer 30. To obviate pointer errors due to this play I provide a supplementary sector 34 arranged to mesh with the pinion 33. This sector 34 is secured upon an arbor 35 suitably mounted in the bearings of the casing out the scale. In order to impart a rocking tendency to the sector 34 I provide a Weight Weight- 36 always tends to rock sector 24 in an anticloekvviso direction thus tendingto roch' pivotal indicator 530 and its attached pinion B2 in a clockwise direction. In this Way the lost motion between the pinion 32 and the driving sector 33 is taken care of inasmuch as the teeth ot' pinion 32 alvvavs lightly press against the right side ot the teeth of sector 323. This action occurs irrespective of the position of the pivotal indicator'.

lllhat I claim is- 1. Weighing` scale includingl in combination with a have lever system of the even balance type, a pendulum load counterbalancing' means connected therewitln a pivotal indicator, a pinion therefor, a sector shaped raelr. operatively connected so as to he movable in unison with said pendulum, counterhalancing means for dri vingr said pinion and a supplementar5v rack meshing with said pinion and having); provisions for causing,lr said pinion to maintain constant enmeshnient vvith onel side ot the teeth ol? said aforementioned sector shaped rack.

2. A Weighing scale including iu comhination with a hase lever system ol the even balance type includingr a plurality ot pans `for supportingapplied loads and load ollsetting Weights, pendulum load counterhalancing means includingr a compensating cam, a tape connecting said cam to a movable part ot said hase lever system, a pivotal indicator, a pinion therefor, a sector shaped rack connected to and movable in unison with said pendulum counterhalancinef means for driving said pinion, and a supplementary rack meshing with the said pinion and having provisions for inaintainingnY the teeth of said pinion in constant enlneshnient with one side ol: the teeth ot the sector shaped rack.

ln testimonyv whereof l hereto allix in v signature.

JOSEPH HOPKINSON. 

